Js. Wang et Cd. Gutsche, Complexation of fullerenes with bis-calix[n]arenes synthesized by tandem Claisen rearrangement, J AM CHEM S, 120(47), 1998, pp. 12226-12231
Bis-calix[n]arenes that are singly and doubly bridged at the upper rims wit
h 2-butenyl or 2-methylenepropyl moieties have been prepared by tandem Clai
sen rearrangement of bis-calix[n]arenes that are singly and doubly bridged
via ether linkages at the lower rims with these same spanners. The complexa
tion behavior of these bis-calixarenes toward C-60 and C-70 has been measur
ed, and a calix[5]arene singly bridged at the upper rims with a 2-butenyl s
panner and carrying allyl groups at all bf the other available p-positions
has been found to be particularly effective.